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Import array dataset

The function mergeArrayData() merges array measurement data to structs that can be read by the SOFiA F/D/T frequency domain transform. The mergeArrayData() function allows to downsample and normalize the impulse responses.

ARGUMENTS

Input

Name Type Purpose Default
impulseResponses float mtx Impulse Response Data
Rows: IR-Data
Cols: Different positions 		-
FS int Sampling Frequency -
temperature float Air Temperature in °C 20
downSample int Downsample Factor 1
normalize int Normalization Flag 1:on 0:off 1

 

Output

Name Type Purpose Default
timeData struct Time domain Data -

The structs contain the following fields:

Field Type Purpose
.impulseResponses float mtx Impulse Response Data N:Channels, M:Samples
.FS int Sampling Frequency
.downSample int Downsampling Factor (from Input)
.averageAirTemp float Average air temperature
.irOverlay float vector Overlay of all impulse responses (PLOT)

 

SOME DETAILS

The downsampling is done using DECIMATE and a FIR low pass filter of order 30. See MATLAB documentation for more information.
(MATLAB Signal Processing Library required for downsampling.)

The normalization is done with respect to the highest overall value found in the complete session.

 

FILE(S):

File Type OS/Matlab
sofia_mergeArrayData.m Help header, Fuction All OS

 

HEADER

/*
timeData = sofia_mergeArrayData(impulseResponses, FS, temperature,...

[downsample], [normalized])

------------------------------------------------------------------------------------
timeData

Struct with fileds:

.impulseResponses

.FS

.downSample

.averageAirTemp

.irOverlay



[N:Channes M:Samples]

 

 

Temperature in DEG

Plot this for a good total

overview if the dataset
------------------------------------------------------------------------------------
impulseResponse Impulse response data [M:Channels N:Samples]
!The audio data must be in in columns as it is
usual in MATLAB. But SOFiA works on audio data
in rows as it is usual in audio editors etc.
Therefore the output IR matrix is flipped over.

FS
Sampling frequency of the source material in 1/s

radius
Array sphere radius in meters

temperature
Average air temperature during the capture
This is important for F/D/T to calculate the
kr-vector. (This value is simply passed thru).

downSample
Downsampling factor [default = 1: No downsampling]
Downsampling is done using DECIMATE and a FIR low
pass filter of order 30. See MATLAB documentation
for more information.
!!! MATLAB Signal Processing Library required

normalize
Normalize flag 1:on, 0:off [default = 1: on]
Normalizes the impulse response with respect to the
absolute maximum value within the complete dataset.

directory
VSA dataset directory. If not definded a user dialog
opens to pick a directory
*/